In this video, composer Chad Cannon offers a look into the creative process behind the music featured in “Fittest on Earth: The Story of the 2015 Reebok CrossFit Games,” co-directed by his brother, Heber.

“Since this is a film for CrossFit and there’s a lot of energy in CrossFit, I couldn’t quite convey that without creating some type of new sound world that can engage with that type of energy level,” Chad explains.

Cannon recalls hearing that the film would include music by Junkie XL, a music producer who worked on the soundtrack for “Mad Max: Fury Road” and remixed the Elvis Presley track “A Little Less Conversation” in 2002. Following Junkie XL’s lead, Cannon decided to build his own percussion library by creating and recording unique sounds.

“My landlord collects all sorts of metal, so I said, ‘Hey, John, we could make a lot of noise with your junk in your junkyard,’” Cannon says.

Using wagon wheels, oil barrels, old gasoline tanks and other scraps, the two set to work building their own musical instruments. Cannon then combined the new with the traditional to “make this original percussion sound” that would “capture the energy” of the CrossFit community.

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